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		// console.log(Math.PI);
		// document.write(Math.abs(-89));

		// document.write(Math.round('67.89ab'));
		// document.write(Math.ceil('67.000000001'));
		// document.write(Math.floor('67.99999'));
		
		// document.write(Math.round(Math.random()*100));
		// 
		num = Math.round(Math.random()*(10-5)+5);

		document.write(num);


		1 1-49 产生7个不重复的数
		
		2 ['小明','小红','小花','小李','小王'];

		// 100  99.5555   50  50.999 49.5555  0
		// 
		
		交互  alert() document.write() console.log 

		存储  var arr  obj.attr

		流程 if  for  while do

		封装 function obj

		内置函数  arr str math date

		特别 


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